CN112143860B - Production method of 250 MPa-grade high-strength interstitial-free steel - Google Patents
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Abstract
The invention relates to a production method of 250MPa grade high-strength interstitial-free steel, which adopts a low-carbon, low-silicon, high-phosphorus manganese, Nb and Ti composite component system, and obtains the high-strength interstitial-free steel with yield strength more than or equal to 250MPa, tensile strength more than or equal to 440MPa, yield ratio less than or equal to 0.65, r value more than or equal to 1.5, good processing brittleness and good surface quality by reasonably controlling process temperature parameters, front section cooling and U-shaped coiling modes, high cold rolling reduction rate, stable pickling speed and stable control of annealing atmosphere, temperature and leakage point, and is particularly suitable for manufacturing automobile stamping parts with certain stamping performance and higher strength.
Description
Technical Field
The invention belongs to the technical field of continuous annealing high-strength gapless atomic steel for automobiles, and particularly relates to a production method of 250 MPa-grade high-strength gapless atomic steel.
Background
With the arrival of the six-standard times of automobile emission countries, the weight reduction and the light weight of automobiles become necessary ways for the automobile industry, and meanwhile, the high-strength gapless atomic steel plate with high strength and ultra-deep drawing performance has a larger market space, wherein the high-strength gapless atomic cold-rolled steel strip with the yield strength of more than or equal to 250MPa, the tensile strength of more than or equal to 440MPa and the plastic strain ratio r value of more than or equal to 1.5 representing the deep drawing performance becomes an important research direction for enterprises to adapt to the market.
The high-strength interstitial-free steel is based on interstitial-free steel, the strength is improved by adding P, Si and Mn solid solution strengthening elements, but the strengthening effect of the solid solution strengthening elements is different from the influence on the deep drawing performance. Therefore, the reasonable design of the composition ratio is an important part for researching the high-strength interstitial-free steel.
CN 104561788A provides a phosphorus-containing high-strength interstitial-free steel and a production method thereof. The method is suitable for cover annealing, the annealing time is 8-16 hours, and the yield strength of the product is within 170-210 MPa. The continuous annealing mode is adopted, the production time is short, the efficiency is high, and the yield strength of the product is more than 250 Mpa.
CN 105861929A adopts high Si (0.40-0.50%) component design, reduces the addition of Mn, and obtains a low-cost component system 440MPa grade high-strength interstitial-free steel; the steel adopts low Si and high Mn, and because Mn elements are insensitive to deep drawing performance, enough B is added to inhibit P precipitation, and 250Mp grade high-strength interstitial-free steel insensitive to high deep drawing performance can be obtained.
CN 101348884 discloses a high-strength component system obtained by Nb, Cr and Ti composite micro-alloying, and expensive Cr alloy is added, so that the production cost is high.
Disclosure of Invention
The invention aims to provide a production method of 250MPa grade high-strength interstitial-free atomic steel, which has the advantages of yield strength of more than or equal to 250MPa, tensile strength of more than or equal to 440MPa, yield ratio of less than or equal to 0.65, r value of more than or equal to 1.5, deep drawing, processing brittleness and good surface quality.
The technical scheme adopted by the invention for solving the technical problems is as follows: a production method of 250MPa grade high-strength interstitial-free steel adopts a low-carbon, low-silicon, high-phosphorus manganese, Nb and Ti composite component system, and comprises the following chemical components in percentage by weight: c: less than or equal to 0.005%, Si: 0.08-0.12%, Mn: 1.5% -2.0%, P: 0.06% -0.10%, S: less than or equal to 0.010 percent, Ti: 0.02% -0.05%, Nb: 0.02% -0.04%, B: 0.0005% -0.0020%, Als: 0.02% -0.060%, N: less than or equal to 0.0040 percent, and the balance of Fe and inevitable impurities. The method comprises the following steps: the method comprises the following steps of a plate blank heating process, a hot rolling process, a cooling and coiling process, an acid rolling process, a continuous annealing process and a leveling process, and the high-strength interstitial-free steel with yield strength of more than or equal to 250MPa, tensile strength of more than or equal to 440MPa, yield ratio of less than or equal to 0.65 and r value of more than or equal to 1.5 is prepared.
The production method of 250MPa grade high-strength interstitial-free steel comprises the following specific steps:
1) a slab heating process: heating the steel billet, and dividing the temperature of a soaking section according to the thickness of a hot-rolled product, wherein the thickness of a hot-rolled base material is less than or equal to 2.75mm, and the temperature is set to be 1220-1260 ℃; the thickness of the hot-rolled base stock is more than 2.75mm and less than 6.00mm, and the temperature is set to be 1210-1250 ℃; the slab is divided according to the charging mode in the furnace time, and the hot material: 140-260 min; cooling: 160-320 min.
2) A hot rolling procedure: the pass distribution and each pass reduction rate of the roughing mill and the finishing mill are calculated by a two-stage system roughing set model; the outlet temperature of rough rolling is 1060-1110 ℃, and the finish rolling temperature is 900-940 ℃; the thickness of the rough rolling outlet billet with the thickness of the hot rolling base material being less than or equal to 2.75mm is 30 mm; the thickness of the rough rolling outlet billet is 34mm, the thickness of the hot rolling base material is more than 2.75mm and less than 4.00 mm; the thickness of the rough rolling outlet billet with the thickness of the hot rolling base material being more than or equal to 4.0mm is 36 mm.
3) A cooling and coiling process: adopting a front-section laminar cooling mode after finishing finish rolling; a U-shaped coiling mode is adopted for coiling, and the target temperature is 680 +/-20 ℃; the head and tail temperature is 710 +/-20 ℃.
4) Acid rolling process: removing oxides from the hot-rolled steel coil in an acid washing section, wherein the acid washing speed is not less than 100m/min, then cold rolling is carried out by adopting 50-78% of reduction, the surface reflectivity of the acid-rolled strip steel is more than 60%, and the total amount of residual oil and residual iron is not more than 200mg/m2Residual oil content is less than or equal to 50mg/m2。
5) A continuous annealing process: and continuously annealing the acid-rolled steel strip, wherein the soaking temperature is 820-840 ℃, the slow cooling section finishing temperature is 640-680 ℃, the fast cooling section finishing temperature is 475 +/-5 ℃, and the overaging outlet temperature is 360 +/-15 ℃.
6) Leveling: and flattening the steel coil subjected to continuous annealing, controlling the flattening elongation to be 0.6 +/-0.1%, and then coiling to obtain the finished steel coil.
The invention has the following beneficial effects: the method comprehensively considers the influence of P, Si and Mn strengthening elements on the strength and the stamping performance, and adopts the low-silicon, low-carbon, high-phosphorus, high-manganese, Nb and Ti composite addition to obtain the high-strength gapless atomic steel with yield strength of more than or equal to 250MPa, tensile strength of more than or equal to 440MPa, yield ratio of less than or equal to 0.65, r value of more than or equal to 1.5, deep drawing, processing brittleness and good surface quality; the high-strength and excellent stamping performance is particularly suitable for automobile stamping parts and structural parts which require certain stamping performance and high strength.
Drawings
FIG. 1 is a typical microstructure of a high strength interstitial free steel product of 250MPa grade prepared in example 1 of the present invention.
Detailed Description
The following are specific examples of the present invention and further describe the technical solutions of the present invention, but the scope of the present invention is not limited to these examples. All changes, modifications and equivalents that do not depart from the spirit of the invention are intended to be included within the scope thereof.
A production method of 250MPa grade high-strength interstitial-free steel adopts a low-carbon, low-silicon, high-phosphorus manganese, Nb and Ti composite component system, and comprises the following chemical components in percentage by weight: c: less than or equal to 0.005%, Si: 0.08-0.12%, Mn: 1.5% -2.0%, P: 0.06% -0.10%, S: less than or equal to 0.010 percent, Ti: 0.02% -0.05%, Nb: 0.02% -0.04%, B: 0.0005% -0.0020%, Als: 0.02% -0.060%, N: less than or equal to 0.0040 percent, and the balance of Fe and inevitable impurities.
The production method of 250MPa grade high-strength interstitial-free steel comprises the following specific steps:
1) a slab heating process: heating the steel billet, and dividing the temperature of a soaking section according to the thickness of a hot-rolled product, wherein the thickness of a hot-rolled base material is less than or equal to 2.75mm, and the temperature is set to be 1220-1260 ℃; the thickness of the hot-rolled base stock is more than 2.75mm and less than 6.00mm, and the temperature is set to be 1210-1250 ℃; the slab is divided according to the charging mode in the furnace time, and the hot material: 140-260 min; cooling: 160-320 min.
2) A hot rolling procedure: the pass distribution and each pass reduction rate of the roughing mill and the finishing mill are calculated by a two-stage system roughing set model; the outlet temperature of rough rolling is 1060-1110 ℃, and the finish rolling temperature is 900-940 ℃; the thickness of the rough rolling outlet billet with the thickness of the hot rolling base material being less than or equal to 2.75mm is 30 mm; the thickness of the rough rolling outlet billet is 34mm, the thickness of the hot rolling base material is more than 2.75mm and less than 4.00 mm; the thickness of the rough rolling outlet billet with the thickness of the hot rolling base material being more than or equal to 4.0mm is 36 mm.
3) A cooling and coiling process: adopting a front-section laminar cooling mode after finishing finish rolling; a U-shaped coiling mode is adopted for coiling, and the target temperature is 680 +/-20 ℃; the head and tail temperature is 710 +/-20 ℃.
4) Acid rolling process: removing oxides from the hot-rolled steel coil in an acid washing section, wherein the acid washing speed is not less than 100m/min, then cold rolling is carried out by adopting 50-78% of reduction, the surface reflectivity of the acid-rolled strip steel is more than 60%, and the total amount of residual oil and residual iron is not more than 200mg/m2Residual oil content is less than or equal to 50mg/m2。
5) A continuous annealing procedure: and continuously annealing the acid-rolled steel strip, wherein the soaking temperature is 820-840 ℃, the slow cooling section finishing temperature is 640-680 ℃, the fast cooling section finishing temperature is 475 +/-5 ℃, and the overaging outlet temperature is 360 +/-15 ℃.
6) Leveling: and flattening the steel coil subjected to continuous annealing, controlling the flattening elongation to be 0.6 +/-0.1%, and then coiling to obtain the finished steel coil.
The chemical compositions of the steel slabs of examples 1 to 3 are shown in table 1, and the main process control parameters of the respective steps are shown in table 2.
TABLE 1 actual smelting Components (mass%,%) of examples 1-3
| Examples | C | Si | Mn | P | S | Alt | Nb | B | Ti | N |
| 1 | 0.0038 | 0.08 | 1.50 | 0.1 | 0.003 | 0.020 | 0.020 | 0.0015 | 0.020 | 0.003 |
| 2 | 0.0023 | 0.10 | 2.0 | 0.06 | 0.004 | 0.045 | 0.030 | 0.0005 | 0.050 | 0.004 |
| 3 | 0.0050 | 0.12 | 1.60 | 0.085 | 0.003 | 0.060 | 0.040 | 0.0020 | 0.035 | 0.0032 |
Table 2 main process control parameters of examples 1-3
Samples of 250MPa grade high-strength interstitial-free steel products prepared in examples 1-3 were taken for microstructural analysis and mechanical property testing, and the test and analysis results are specifically shown in Table 3. FIG. 1 is a typical microstructure of a 250MPa grade high strength interstitial free steel product prepared by the process of example 1 of the present invention.
TABLE 3 mechanical Properties of the products prepared in examples 1-3
| Examples | Yield strength/MPa | Tensile strength/MPa | Yield ratio | Elongation A/%) | n | r |
| 1 | 276 | 458 | 0.60 | 39 | 0.218 | 1.603 |
| 2 | 288 | 465 | 0.62 | 37 | 0.199 | 1.571 |
| 3 | 279 | 453 | 0.60 | 36.5 | 0.201 | 1.512 |
According to analysis of mechanical property test results, the 250 MPa-grade high-strength interstitial-free steel products prepared in the embodiments 1-3 have yield strength larger than or equal to 250MPa, tensile strength larger than or equal to 440MPa, yield ratio smaller than or equal to 0.65, r value larger than or equal to 1.5, and have better deep drawing performance indexes; the method is particularly suitable for manufacturing stamping parts which require certain stamping performance and higher strength.
The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (3)
1. A production method of 250MPa grade high-strength interstitial free steel is characterized in that a low-carbon, low-silicon, high-phosphorus manganese, Nb and Ti composite component system is adopted, and the weight percentages of chemical components are as follows: c: less than or equal to 0.005%, Si: 0.08-0.12%, Mn: 1.5% -2.0%, P: 0.06% -0.10%, S: less than or equal to 0.010 percent, Ti: 0.02% -0.05%, Nb: 0.02% -0.04%, B: 0.0005% -0.0020%, Als: 0.02% -0.060%, N: less than or equal to 0.0040 percent, and the balance of Fe and inevitable impurities; the method comprises the following steps: the method comprises the following steps of a plate blank heating process, a hot rolling process, a cooling and coiling process, an acid rolling process, a continuous annealing process and a leveling process, and the high-strength interstitial-free steel with yield strength of more than or equal to 250MPa, tensile strength of more than or equal to 440MPa, yield ratio of less than or equal to 0.65 and r value of more than or equal to 1.5 is prepared;
the slab heating process is specifically controlled as follows: heating the steel billet, and dividing the temperature of a soaking section according to the thickness of a hot-rolled product, wherein the thickness of a hot-rolled base material is less than or equal to 2.75mm, and the temperature is set to be 1220-1260 ℃; the thickness of the hot-rolled base stock is more than 2.75mm and less than 6.00mm, and the temperature is set to be 1210-1250 ℃; the slab is divided according to the charging mode in the furnace time, and the hot material: 140-260 min; cooling: 160-320 min;
the hot rolling process is specifically controlled as follows: the pass distribution and each pass reduction rate of the roughing mill and the finishing mill are calculated by a two-stage system roughing set model; the outlet temperature of rough rolling is 1060-1110 ℃, and the finish rolling temperature is 900-940 ℃; the thickness of a rough rolling outlet billet with the thickness of the hot rolling base material being less than or equal to 2.75mm is 30 mm; the thickness of the rough rolling outlet billet is 34mm, the thickness of the hot rolling base material is more than 2.75mm and less than 4.00 mm; the thickness of a rough rolling outlet billet with the thickness of the hot rolling base material being more than or equal to 4.0mm is 36 mm;
the cooling and coiling processes are specifically controlled as follows: adopting a front-section laminar cooling mode after finishing finish rolling; a U-shaped coiling mode is adopted for coiling, and the target temperature is 680 +/-20 ℃; the head and tail temperature is 710 +/-20 ℃;
the continuous annealing process is specifically controlled as follows: and continuously annealing the acid-rolled steel strip, wherein the soaking temperature is 820-840 ℃, the slow cooling section finishing temperature is 640-680 ℃, the fast cooling section finishing temperature is 475 +/-5 ℃, and the overaging outlet temperature is 360 +/-15 ℃.
2. The method for producing the 250MPa grade high-strength interstitial-free steel according to claim 1, wherein the acid rolling process is specifically controlled as follows: removing oxides from the hot-rolled steel coil in an acid washing section, wherein the acid washing speed is not less than 100m/min, then cold rolling is carried out by adopting 50-78% of reduction, the surface reflectivity of the acid-rolled strip steel is more than 60%, and the total amount of residual oil and residual iron is not more than 200mg/m2Residual oil content is less than or equal to 50mg/m2。
3. The method for producing the 250MPa grade high-strength interstitial-free steel according to claim 1, wherein the flattening process is specifically controlled as follows: and flattening the steel coil subjected to continuous annealing, controlling the flattening elongation to be 0.6 +/-0.1%, and then coiling to obtain the finished steel coil.
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